Explore the wider topic in our cash flow management guide.
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Cash conversion cycle formula
Cash conversion cycle = days inventory outstanding + days sales outstanding − days payables outstanding. These components are often shortened to DIO, DSO and DPO. Use the same period and a consistent number of days for all three.
DIO estimates how long inventory is held. DSO estimates how long receivables take to collect. DPO estimates the time taken to pay suppliers. The combined measure describes an average cycle, not the actual date on which a particular invoice will be paid.
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Calculate DIO, DSO and DPO consistently
| Component | Calculation | Check |
|---|---|---|
| DIO | Average inventory ÷ cost of sales × days in period. | Use comparable inventory and cost-of-sales values. |
| DSO | Average trade receivables ÷ credit sales × days in period. | Cash sales can distort the result if included without explanation. |
| DPO | Average trade payables ÷ credit purchases × days in period. | Cost of sales is sometimes a proxy, but explain the limitation. |
Opening and closing balances can provide a simple average, but monthly or more frequent balances may better represent seasonal trading. Keep GST and other tax treatment consistent between balances and flows. A ratio built from mismatched figures can look precise while describing very little.
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A worked cash conversion cycle example
Assume a hypothetical business has average inventory of $120,000 and annual cost of sales of $730,000. Using 365 days, DIO is 60 days. Average trade receivables of $180,000 against annual credit sales of $1,460,000 give DSO of 45 days. Average trade payables of $60,000 against annual credit purchases of $730,000 give DPO of 30 days.
The cash conversion cycle is therefore 60 + 45 − 30 = 75 days. These NZD figures are invented to explain the arithmetic. They are not a benchmark for a particular industry or a promise about payment timing.
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Cash conversion cycle calculator
Enter the three day measures calculated on a consistent basis. The result is an estimate of the average operating cash cycle. It does not forecast bank balances or account for every cash movement.
To plan actual payment dates, use cash flow forecasting. The ratio and the forecast answer related but different questions.
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What a high, low or negative cycle means
A longer cycle usually means more cash is tied up in the measured operating process. A shorter cycle may release cash, but the reason matters. Lower inventory could reflect better planning or inadequate stock. Longer payable days could reflect agreed terms or overdue suppliers.
A negative cycle can occur when customers pay before suppliers are paid, as in some retail or advance-payment models. It is not automatically a problem or proof of a superior business. Consider customer obligations, seasonality, supplier relationships and the sustainability of the arrangement.
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Improve the cause, not just the ratio
- Inventory: review slow-moving stock, purchasing quantities, lead times and demand assumptions.
- Receivables: invoice promptly, resolve disputes, monitor overdue balances and use appropriate customer terms.
- Payables: plan payments and negotiate suitable terms rather than simply delaying them.
- Process: identify hand-offs that delay billing, delivery or collection.
A working capital review examines the operating detail. If a hypothetical business reduces DSO by five days on $1.46 million of annual credit sales, the simplified average receivables reduction is $20,000. Actual cash release depends on trading, collections and the assumptions holding.
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Know when the measure needs adaptation
Service businesses with little inventory may focus more on billing delays, unbilled work and receivables. Fast-growing or seasonal businesses need careful balance averages. One-off balance-sheet movements can make a single year's result misleading.
Compare the components over time and investigate changes. Our cash flow management guide connects the cycle with forecasts, shortfalls and performance decisions. We help owners identify which operational changes are likely to improve the cash position without harming delivery.
Common questions
Is a shorter cash conversion cycle always better?
Not automatically. Stock shortages, overdue suppliers or unsustainable payment practices can shorten the measure while creating other problems. Understand the reason for the change.
Can I use total sales instead of credit sales?
It may be a practical proxy when credit-sales data is unavailable, but cash sales can distort DSO. State the basis and compare periods consistently.
Does the cash conversion cycle replace a cash forecast?
No. It is an average working-capital indicator. A forecast shows expected receipts and payments at particular times, including items outside the operating cycle.
Your next move
Find the pressure in your cash cycle
Bring your inventory, receivables and payables information with the trading period they relate to. We can help identify the drivers and the practical changes worth testing.
Find the pressure in your cash cycle